I could blow you could blow she could blow we could blow you could blow they could blow
V-ing form
I could be blowing you could be blowing she could be blowing we could be blowing you could be blowing they could be blowing
Perfect
I could have blown you could have blown she could have blown we could have blown you could have blown they could have blown
V-ing perfect
I could have been blowing you could have been blowing she could have been blowing we could have been blowing you could have been blowing they could have been blowing
Negation
Simple form
I couldn't blow you couldn't blow she couldn't blow we couldn't blow you couldn't blow they couldn't blow
V-ing form
I couldn't be blowing you couldn't be blowing she couldn't be blowing we couldn't be blowing you couldn't be blowing they couldn't be blowing
Perfect
I couldn't have blown you couldn't have blown she couldn't have blown we couldn't have blown you couldn't have blown they couldn't have blown
V-ing perfect
I couldn't have been blowing you couldn't have been blowing she couldn't have been blowing we couldn't have been blowing you couldn't have been blowing they couldn't have been blowing
Interrogative form
Simple form
could I blow? could you blow? could she blow? could we blow? could you blow? could they blow?
V-ing form
could I be blowing? could you be blowing? could she be blowing? could we be blowing? could you be blowing? could they be blowing?
Perfect
could I have blown? could you have blown? could she have blown? could we have blown? could you have blown? could they have blown?
V-ing perfect
could I have been blowing? could you have been blowing? could she have been blowing? could we have been blowing? could you have been blowing? could they have been blowing?
Interro-negative form
Simple form
couldn't I blow? couldn't you blow? couldn't she blow? couldn't we blow? couldn't you blow? couldn't they blow?
V-ing form
couldn't I be blowing? couldn't you be blowing? couldn't she be blowing? couldn't we be blowing? couldn't you be blowing? couldn't they be blowing?
Perfect
couldn't I have blown? couldn't you have blown? couldn't she have blown? couldn't we have blown? couldn't you have blown? couldn't they have blown?
V-ing perfect
couldn't I have been blowing? couldn't you have been blowing? couldn't she have been blowing? couldn't we have been blowing? couldn't you have been blowing? couldn't they have been blowing?